).rejects.toThrow("Exceeded tool-call argument buffer limit");

});

});

describe("buildOpenAICompletionsParams strips response-only reasoning fields", () => {

// OpenRouter and other OpenAI-Completions providers echo `reasoning_details`

// (array) and `reasoning_content` (string) in response choices to expose the

// model's chain of thought. If those fields leak back into a follow-up

// request, OpenRouter rejects the call with HTTP 500 ("Internal Server

// Error"). buildOpenAICompletionsParams must scrub them before the wire.

// Repro recipe (verified against live OpenRouter):

// POST /chat/completions with messages[*].reasoning_details: "..." => 500

// Same body without that key => 200

const baseModel = {

id: "deepseek/deepseek-v4-flash",

name: "DeepSeek v4 Flash",

api: "openai-completions",

provider: "openrouter",

baseUrl: "https://openrouter.ai/api/v1",

reasoning: true,

input: ["text"],

cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },

contextWindow: 128_000,

maxTokens: 8192,

} satisfies Model<"openai-completions">;

function getAssistantMessage(params: { messages: unknown }) {

expect(Array.isArray(params.messages)).toBe(true);

const list = params.messages as Array<Record<string, unknown>>;

const assistant = list.find((m) => m.role === "assistant");

expect(assistant).toBeDefined();

return assistant as Record<string, unknown>;

}

it("removes reasoning_details, reasoning_content, and reasoning from assistant replay", () => {

const params = buildOpenAICompletionsParams(

baseModel,

{

systemPrompt: "system",

messages: [

{ role: "user", content: "你好" },

{

role: "assistant",

provider: "openrouter",

api: "openai-completions",

model: "deepseek/deepseek-v4-flash",

stopReason: "stop",

timestamp: 0,

content: [

{

type: "thinking",

thinking: "User said hi, I should respond politely.",

thinkingSignature: "considering",

},

{ type: "text", text: "Hello!" },

],

},

{ role: "user", content: "再来一个" },

],

tools: [],

} as never,

undefined,

) as { messages: unknown };

const assistant = getAssistantMessage(params);

expect(assistant).not.toHaveProperty("reasoning_details");

expect(assistant).not.toHaveProperty("reasoning_content");

expect(assistant).not.toHaveProperty("reasoning");

});

});